MBWorld.org Forums - New to me E55, have some issues and questions.

So while my 2012 CL65 is away getting all the go fast mods done I bought a super clean 2002 Corvette to play with. Well to make a long story short a buddy loved it and traded me his 2003 E55 straight across. Love the car but it has a few issues. It does have some modifications and has the SC crank pulley, long tubes, full custom exhaust, carbon spoiler and lip as well as diffuser, CLS wheels, new air suspension all the way around, larger supercharger heat exchanger, trunk mounted ice box and larger cooler pumps. Has a few other things but I forget what they are right now. Says car makes 55Xrwhp and 700rwtq which I dont doubt as it just waxed my buddies modded 03 Cobra as well as a few other cars I know my modded RS6 could not beat.

At any rate I have a few questions.
1. He said there is a throttle body replacement that can add 30ish HP. Is this true and where do I get it and do I have to do anything else to the car to make it work?
2. Is there a way to link all 4 temp buttons so the driver control changes all at the same time?
3. There is a hose sticking out of the back of both heads thats T'd together and then just is open above the passenger exhaust. When I get on it oil drips on the passenger exhaust and that cant be right so where is it supposed to connect to? I saw a small filter in the trunk that had oil on it and its fitting fit the hose so I put it on it and raised it above the heads thinking it must be a breather and was changed so it does not suck back into the intake. I would like it to be proper though so looking for suggestions.
4. The alarm does not make any noise when arming or when using the panic feature. Is this the siren issue I read about and need to replace that siren behind the front passenger tire under the splash shield?
5. The buttons on the front of the seats seem to do nothing. It does not have the dynamic seats and no manual so I assume they are lumbar and bolster control. I hear a pump run but feel nothing happening. Is there a common issue/fix?
6. I assume the radio does not have bluetooth and wondered whats the best (if any) add on module for that. I hit the phone button and it says there is no phone connected but I see no menu for connecting via bluetooth.
7. The windshield washer tank appears to leak SOMEWHERE. Not sure where but that was the cars only error and when i filled it about 20 minutes latter I saw a puddle start to form nearly dead center at the firewall level under the car. Again, is there a common issue here before I just pull it all apart? I would probably never use it and if the leak isnt in the bottle itself I would probably just unplug the level sensor and dead short it.
8. Its a German car and has the speedometer in KM. I know it has a digital readout in US miles but is it a big deal to change the cluster to an American version? I have a shop and an Autel Elite system so I can program pretty much anything but have yet to work on a Benz.

I appreciate all and any help. Here are some shots of my new toy. :)

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